![Linus Torvalds](/assets/img/avatar_default.png)
- Generic PM domains support update including new PM domain callbacks to handle device initialization better (Russell King, Rafael J Wysocki, Kevin Hilman). - Unified device properties API update including a new mechanism for accessing data provided by platform initialization code (Rafael J Wysocki, Adrian Hunter). - ARM cpuidle update including ARM32/ARM64 handling consolidation (Daniel Lezcano). - intel_idle update including support for the Silvermont Core in the Baytrail SOC and for the Airmont Core in the Cherrytrail and Braswell SOCs (Len Brown, Mathias Krause). - New cpufreq driver for Hisilicon ACPU (Leo Yan). - intel_pstate update including support for the Knights Landing chip (Dasaratharaman Chandramouli, Kristen Carlson Accardi). - QorIQ cpufreq driver update (Tang Yuantian, Arnd Bergmann). - powernv cpufreq driver update (Shilpasri G Bhat). - devfreq update including Tegra support changes (Tomeu Vizoso, MyungJoo Ham, Chanwoo Choi). - powercap RAPL (Running-Average Power Limit) driver update including support for Intel Broadwell server chips (Jacob Pan, Mathias Krause). - ACPI device enumeration update related to the handling of the special PRP0001 device ID allowing DT-style 'compatible' property to be used for ACPI device identification (Rafael J Wysocki). - ACPI EC driver update including limited _DEP support (Lan Tianyu, Lv Zheng). - ACPI backlight driver update including a new mechanism to allow native backlight handling to be forced on non-Windows 8 systems and a new quirk for Lenovo Ideapad Z570 (Aaron Lu, Hans de Goede). - New Windows Vista compatibility quirk for Sony VGN-SR19XN (Chen Yu). - Assorted ACPI fixes and cleanups (Aaron Lu, Martin Kepplinger, Masanari Iida, Mika Westerberg, Nan Li, Rafael J Wysocki). - Fixes related to suspend-to-idle for the iTCO watchdog driver and the ACPI core system suspend/resume code (Rafael J Wysocki, Chen Yu). - PM tracing support for the suspend phase of system suspend/resume transitions (Zhonghui Fu). - Configurable delay for the system suspend/resume testing facility (Brian Norris). - PNP subsystem cleanups (Peter Huewe, Rafael J Wysocki). / -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABCAAGBQJVLbO+AAoJEILEb/54YlRx5N4QAJXsmEW1FL2l6mMAyTQkEsVj nbqjF9I6aJgYM9+i8GKaZJxpN17SAZ7Ii7aCAXjPwX8AvjT70+gcZr+KDWtPir61 B75VNVEcUYOR4vOF5Z6rQcQMlhGPkfMOJYXFMahpOG6DdPbVh1x2/tuawfc6IC0V a6S/fln6WqHrXQ+8swDSv1KuZsav6+8AQaTlNUQkkuXdY9b3k/3xiy5C2K26APP8 x1B39iAF810qX6ipnK0gEOC3Vs29dl7hvNmgOVmmkBGVS7+pqTuy5n1/9M12cDRz 78IQ7DXB0NcSwr5tdrmGVUyH0Q6H9lnD3vO7MJkYwKDh5a/2MiBr2GZc4KHDKDWn E1sS27f1Pdn9qnpWLzTcY+yYNV3EEyre56L2fc+sh+Xq9sNOjUah+Y/eAej/IxYD XYRf+GAj768yCJgNP+Y3PJES/PRh+0IZ/dn5k0Qq2iYvc8mcObyG6zdQIvCucv/i 70uV1Z2GWEb31cI9TUV8o5GrMW3D0KI9EsCEEpiFFUnhjNog3AWcerGgFQMHxu7X ZnNSzudvek+XJ3NtpbPgTiJAmnMz8bDvBQm3G1LUO2TQdjYTU6YMUHsfzXs8DL6c aIMWO4stkVuDtWrlT/hfzIXepliccyXmSP6sbH+zNNCepulXe5C4M2SftaDi4l/B uIctXWznvHoGys+EFL+v =erd3 -----END PGP SIGNATURE----- Merge tag 'pm+acpi-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management and ACPI updates from Rafael Wysocki: "These are mostly fixes and cleanups all over, although there are a few items that sort of fall into the new feature category. First off, we have new callbacks for PM domains that should help us to handle some issues related to device initialization in a better way. There also is some consolidation in the unified device properties API area allowing us to use that inferface for accessing data coming from platform initialization code in addition to firmware-provided data. We have some new device/CPU IDs in a few drivers, support for new chips and a new cpufreq driver too. Specifics: - Generic PM domains support update including new PM domain callbacks to handle device initialization better (Russell King, Rafael J Wysocki, Kevin Hilman) - Unified device properties API update including a new mechanism for accessing data provided by platform initialization code (Rafael J Wysocki, Adrian Hunter) - ARM cpuidle update including ARM32/ARM64 handling consolidation (Daniel Lezcano) - intel_idle update including support for the Silvermont Core in the Baytrail SOC and for the Airmont Core in the Cherrytrail and Braswell SOCs (Len Brown, Mathias Krause) - New cpufreq driver for Hisilicon ACPU (Leo Yan) - intel_pstate update including support for the Knights Landing chip (Dasaratharaman Chandramouli, Kristen Carlson Accardi) - QorIQ cpufreq driver update (Tang Yuantian, Arnd Bergmann) - powernv cpufreq driver update (Shilpasri G Bhat) - devfreq update including Tegra support changes (Tomeu Vizoso, MyungJoo Ham, Chanwoo Choi) - powercap RAPL (Running-Average Power Limit) driver update including support for Intel Broadwell server chips (Jacob Pan, Mathias Krause) - ACPI device enumeration update related to the handling of the special PRP0001 device ID allowing DT-style 'compatible' property to be used for ACPI device identification (Rafael J Wysocki) - ACPI EC driver update including limited _DEP support (Lan Tianyu, Lv Zheng) - ACPI backlight driver update including a new mechanism to allow native backlight handling to be forced on non-Windows 8 systems and a new quirk for Lenovo Ideapad Z570 (Aaron Lu, Hans de Goede) - New Windows Vista compatibility quirk for Sony VGN-SR19XN (Chen Yu) - Assorted ACPI fixes and cleanups (Aaron Lu, Martin Kepplinger, Masanari Iida, Mika Westerberg, Nan Li, Rafael J Wysocki) - Fixes related to suspend-to-idle for the iTCO watchdog driver and the ACPI core system suspend/resume code (Rafael J Wysocki, Chen Yu) - PM tracing support for the suspend phase of system suspend/resume transitions (Zhonghui Fu) - Configurable delay for the system suspend/resume testing facility (Brian Norris) - PNP subsystem cleanups (Peter Huewe, Rafael J Wysocki)" * tag 'pm+acpi-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (74 commits) ACPI / scan: Fix NULL pointer dereference in acpi_companion_match() ACPI / scan: Rework modalias creation when "compatible" is present intel_idle: mark cpu id array as __initconst powercap / RAPL: mark rapl_ids array as __initconst powercap / RAPL: add ID for Broadwell server intel_pstate: Knights Landing support intel_pstate: remove MSR test cpufreq: fix qoriq uniprocessor build ACPI / scan: Take the PRP0001 position in the list of IDs into account ACPI / scan: Simplify acpi_match_device() ACPI / scan: Generalize of_compatible matching device property: Introduce firmware node type for platform data device property: Make it possible to use secondary firmware nodes PM / watchdog: iTCO: stop watchdog during system suspend cpufreq: hisilicon: add acpu driver ACPI / EC: Call acpi_walk_dep_device_list() after installing EC opregion handler cpufreq: powernv: Report cpu frequency throttling intel_idle: Add support for the Airmont Core in the Cherrytrail and Braswell SOCs intel_idle: Update support for Silvermont Core in Baytrail SOC PM / devfreq: tegra: Register governor on module init ...
249 lines
5.9 KiB
C
249 lines
5.9 KiB
C
/*
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* OMAP4+ CPU idle Routines
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*
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* Copyright (C) 2011-2013 Texas Instruments, Inc.
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* Santosh Shilimkar <santosh.shilimkar@ti.com>
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* Rajendra Nayak <rnayak@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/sched.h>
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#include <linux/cpuidle.h>
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#include <linux/cpu_pm.h>
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#include <linux/export.h>
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#include <linux/tick.h>
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#include <asm/cpuidle.h>
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#include "common.h"
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#include "pm.h"
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#include "prm.h"
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#include "clockdomain.h"
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#define MAX_CPUS 2
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/* Machine specific information */
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struct idle_statedata {
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u32 cpu_state;
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u32 mpu_logic_state;
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u32 mpu_state;
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};
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static struct idle_statedata omap4_idle_data[] = {
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{
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.cpu_state = PWRDM_POWER_ON,
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.mpu_state = PWRDM_POWER_ON,
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.mpu_logic_state = PWRDM_POWER_RET,
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},
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{
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.cpu_state = PWRDM_POWER_OFF,
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.mpu_state = PWRDM_POWER_RET,
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.mpu_logic_state = PWRDM_POWER_RET,
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},
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{
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.cpu_state = PWRDM_POWER_OFF,
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.mpu_state = PWRDM_POWER_RET,
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.mpu_logic_state = PWRDM_POWER_OFF,
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},
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};
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static struct powerdomain *mpu_pd, *cpu_pd[MAX_CPUS];
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static struct clockdomain *cpu_clkdm[MAX_CPUS];
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static atomic_t abort_barrier;
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static bool cpu_done[MAX_CPUS];
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static struct idle_statedata *state_ptr = &omap4_idle_data[0];
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/* Private functions */
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/**
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* omap_enter_idle_[simple/coupled] - OMAP4PLUS cpuidle entry functions
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* @dev: cpuidle device
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* @drv: cpuidle driver
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* @index: the index of state to be entered
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*
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* Called from the CPUidle framework to program the device to the
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* specified low power state selected by the governor.
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* Returns the amount of time spent in the low power state.
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*/
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static int omap_enter_idle_simple(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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omap_do_wfi();
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return index;
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}
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static int omap_enter_idle_coupled(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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struct idle_statedata *cx = state_ptr + index;
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u32 mpuss_can_lose_context = 0;
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/*
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* CPU0 has to wait and stay ON until CPU1 is OFF state.
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* This is necessary to honour hardware recommondation
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* of triggeing all the possible low power modes once CPU1 is
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* out of coherency and in OFF mode.
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*/
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if (dev->cpu == 0 && cpumask_test_cpu(1, cpu_online_mask)) {
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while (pwrdm_read_pwrst(cpu_pd[1]) != PWRDM_POWER_OFF) {
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cpu_relax();
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/*
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* CPU1 could have already entered & exited idle
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* without hitting off because of a wakeup
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* or a failed attempt to hit off mode. Check for
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* that here, otherwise we could spin forever
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* waiting for CPU1 off.
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*/
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if (cpu_done[1])
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goto fail;
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}
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}
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mpuss_can_lose_context = (cx->mpu_state == PWRDM_POWER_RET) &&
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(cx->mpu_logic_state == PWRDM_POWER_OFF);
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tick_broadcast_enter();
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/*
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* Call idle CPU PM enter notifier chain so that
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* VFP and per CPU interrupt context is saved.
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*/
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cpu_pm_enter();
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if (dev->cpu == 0) {
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pwrdm_set_logic_retst(mpu_pd, cx->mpu_logic_state);
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omap_set_pwrdm_state(mpu_pd, cx->mpu_state);
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/*
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* Call idle CPU cluster PM enter notifier chain
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* to save GIC and wakeupgen context.
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*/
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if (mpuss_can_lose_context)
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cpu_cluster_pm_enter();
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}
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omap4_enter_lowpower(dev->cpu, cx->cpu_state);
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cpu_done[dev->cpu] = true;
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/* Wakeup CPU1 only if it is not offlined */
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if (dev->cpu == 0 && cpumask_test_cpu(1, cpu_online_mask)) {
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if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD) &&
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mpuss_can_lose_context)
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gic_dist_disable();
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clkdm_wakeup(cpu_clkdm[1]);
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omap_set_pwrdm_state(cpu_pd[1], PWRDM_POWER_ON);
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clkdm_allow_idle(cpu_clkdm[1]);
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if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD) &&
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mpuss_can_lose_context) {
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while (gic_dist_disabled()) {
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udelay(1);
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cpu_relax();
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}
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gic_timer_retrigger();
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}
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}
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/*
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* Call idle CPU PM exit notifier chain to restore
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* VFP and per CPU IRQ context.
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*/
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cpu_pm_exit();
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/*
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* Call idle CPU cluster PM exit notifier chain
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* to restore GIC and wakeupgen context.
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*/
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if (dev->cpu == 0 && mpuss_can_lose_context)
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cpu_cluster_pm_exit();
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tick_broadcast_exit();
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fail:
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cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
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cpu_done[dev->cpu] = false;
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return index;
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}
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/*
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* For each cpu, setup the broadcast timer because local timers
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* stops for the states above C1.
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*/
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static void omap_setup_broadcast_timer(void *arg)
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{
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tick_broadcast_enable();
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}
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static struct cpuidle_driver omap4_idle_driver = {
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.name = "omap4_idle",
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.owner = THIS_MODULE,
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.states = {
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{
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/* C1 - CPU0 ON + CPU1 ON + MPU ON */
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.exit_latency = 2 + 2,
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.target_residency = 5,
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.enter = omap_enter_idle_simple,
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.name = "C1",
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.desc = "CPUx ON, MPUSS ON"
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},
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{
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/* C2 - CPU0 OFF + CPU1 OFF + MPU CSWR */
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.exit_latency = 328 + 440,
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.target_residency = 960,
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.flags = CPUIDLE_FLAG_COUPLED,
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.enter = omap_enter_idle_coupled,
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.name = "C2",
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.desc = "CPUx OFF, MPUSS CSWR",
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},
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{
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/* C3 - CPU0 OFF + CPU1 OFF + MPU OSWR */
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.exit_latency = 460 + 518,
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.target_residency = 1100,
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.flags = CPUIDLE_FLAG_COUPLED,
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.enter = omap_enter_idle_coupled,
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.name = "C3",
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.desc = "CPUx OFF, MPUSS OSWR",
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},
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},
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.state_count = ARRAY_SIZE(omap4_idle_data),
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.safe_state_index = 0,
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};
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/* Public functions */
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/**
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* omap4_idle_init - Init routine for OMAP4+ idle
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*
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* Registers the OMAP4+ specific cpuidle driver to the cpuidle
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* framework with the valid set of states.
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*/
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int __init omap4_idle_init(void)
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{
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mpu_pd = pwrdm_lookup("mpu_pwrdm");
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cpu_pd[0] = pwrdm_lookup("cpu0_pwrdm");
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cpu_pd[1] = pwrdm_lookup("cpu1_pwrdm");
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if ((!mpu_pd) || (!cpu_pd[0]) || (!cpu_pd[1]))
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return -ENODEV;
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cpu_clkdm[0] = clkdm_lookup("mpu0_clkdm");
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cpu_clkdm[1] = clkdm_lookup("mpu1_clkdm");
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if (!cpu_clkdm[0] || !cpu_clkdm[1])
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return -ENODEV;
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/* Configure the broadcast timer on each cpu */
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on_each_cpu(omap_setup_broadcast_timer, NULL, 1);
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return cpuidle_register(&omap4_idle_driver, cpu_online_mask);
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}
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